You can generally upload files up to a file size of 100 MB/file.
If your file is too big, you can reduce its size using an image editing program. Just make sure the resolution stays at least 150 dpi.
Another option is to save the file as a JPG with a smaller file size or convert a large TIFF file to JPG.
If you need further assistance, please contact our customer service team directly at +1 (833) 961-2275 or service@myposter.com
We are available by phone Monday to Friday from 7:00 AM to 11:00 AM (EST) and always happy to assist wherever we can.